EP1079009A2 - Dispositif et procédé pour former une fausse lisière sur un métier à tisser - Google Patents
Dispositif et procédé pour former une fausse lisière sur un métier à tisser Download PDFInfo
- Publication number
- EP1079009A2 EP1079009A2 EP00111570A EP00111570A EP1079009A2 EP 1079009 A2 EP1079009 A2 EP 1079009A2 EP 00111570 A EP00111570 A EP 00111570A EP 00111570 A EP00111570 A EP 00111570A EP 1079009 A2 EP1079009 A2 EP 1079009A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- selvedge
- weave
- yarns
- parameters
- moment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000009941 weaving Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000003780 insertion Methods 0.000 claims description 12
- 230000037431 insertion Effects 0.000 claims description 12
- 238000003860 storage Methods 0.000 claims description 4
- 239000004744 fabric Substances 0.000 abstract description 20
- 238000005520 cutting process Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
- D03C11/00—Selvedge shedding mechanisms not forming part of main shedding mechanism
Definitions
- the present invention concerns a device and a method to form the split selvedge in weaving looms, particularly gripper looms.
- the split selvedge is used to keep the weft yarns tensioned during and soon after their insertion into the shed, and to allow a regular cutting thereof in order to produce fabrics having a uniform fringe of weft yarn tails.
- a group of warp yarns forming the split selvedge is placed at the two sides of the normal warp yarns meant to form the fabric, and at a certain distance therefrom, thereby forming a lateral extension of the warp shed.
- Such selvedge yarns are guided by means of at least two yarn-guide elements, which alternately move them in groups in opposite directions, so that said yarns - as an extension of the warp shed formed by the warp yarns meant to form the fabric - are apt to form a lateral warp shed which opens and closes, housing the ends of the weft yarns.
- These last ones are then tied between the selvedge yarns according to a predetermined pattern, the so-called weave.
- the split selvedge has been thus formed it is possible, by acting thereon with tensioning devices such as the templets, to proceed to the cutting of the weft yarns - in the zone between the fabric and the split selvedge, where no warp yarns are present - at the desired distance from the edge of the fabric, and while the weft yarns are perfectly tensioned; this allows to obtain a lateral fringe of weft yarn tails of perfectly uniform length, and thus particularly appreciated for the high finishing level conferred to the fabric.
- tensioning devices such as the templets
- the conventional devices to form the split selvedge are moved, through a synchronized mechanism, by the main motion of the loom.
- This allows to accomplish certain types of weaves, for instance a one-one weave wherein a link is formed at each weft insertion, or else a two-two weave wherein a link is formed at each two successive weft insertions.
- To change from one weave pattern to another it is necessary to replace some elements which operate the selvedge forming device - for instance the gearwheels - between the control lever and the main shaft of the loom. This replacement, besides involving a waste of time, forcedly requires to stop the loom thereby determining a slowing down of the production.
- Such conventional devices equally allow, by adopting cam mechanisms, to form other weave patterns, for instance one-two weaves, wherein a first weft yarn is tied and the two subsequently inserted weft yarns are then tied together.
- To change the preset weave pattern it is of course necessary to replace the cams of the mechanism, with the same inconveniences reported hereabove.
- the yarn-guide elements are moved forward and backward between their end positions by means of the motors described in the aforecited patent applications. Since the movement of such motors is fully independent from the main motion of the loom, it is possible to vary the timing of said motors in respect of the main motion of the loom, so as to obtain any desired weave. For example, if the yarn-guide elements are moved by said motors forward and backward between their end positions at each weaving cycle, a one-one weave is formed in the split selvedge. Whereas, if the forward and backward movement of the yarn-guide elements is completed at each two or three weaving cycles, a two-two or three-three weave is formed. It is also possible to cause such motors to operate alternate cycles between those cited above, so as to obtain a relative motion of the yarn-guide elements apt to form weaves at will, for example a one-two or a one-three weave.
- This second type of selvedge forming devices has thus proved to be more versatile.
- Such devices are currently preferred also because, being free from any mechanical connection to the main motion of the loom, they can be easily mounted on a loom and removed again from the same. Furthermore, they can be applied on the frame of the loom, adjustable in respect of the loom width, so as to be used also in looms weaving fabrics of different widths, or more pieces of fabric.
- the object of the present invention is to thus overcome the aforementioned drawback, by supplying a device and a method to form the split selvedge, which allows to tie all the wefts with the same tension so that the fringe of the fabric, once it has been removed from the split selvedge, turns out to be of a perfectly uniform length.
- said object is reached by means of a device as in the characterizing portion of Claim 1, and by means of a method as in the characterizing portion of Claim 6.
- Fig. 1 diagrammatically illustrates a weaving loom T, of the type with grippers P and a weft yarn presenting device S, meant for weaving two pieces of fabric C.
- the top part of the loom comprises - fixed in an adjustable position to an upper crosspiece F of the loom - devices to form the split selvedge A and devices to form the leno heald weave B, all equipped with autonomous motor means, for example of the type described in the introductory part of the present description.
- Each device to form the split selvedge A comprises at least one pair of yarn-guide elements, apt to move alternately and in opposite directions the warp yarns O A meant to form the split selvedge A, just as done by the heald frames in respect of the warp yarns O C meant to form the fabric C.
- the selvedge forming devices operated by means of linear motors or step-by-step motors of the aforedescribed type, it is possible to cause the moment of mutual shifting of the selvedge yarns to coincide with a very precise time of the weaving cycle, not only in a constant manner for a specific fabric, but individually on each inserted weft, thereby allowing to obtain a punctual and precise control on the stopping modes of each single weft.
- the logic functions of the loom are modified as per the block diagram of fig. 2.
- the central processing and control unit U of the loom sends instructions to the weft presenting device S to select a special weft, it contextually provides to interrogate a parametric table R, previously stored into a storage area of the same unit U, obtaining therefrom a default value of the moment of mutual shifting of the selvedge yarns, which is most appropriate for that particular weft.
- the parametric table R can, for example, be prearranged so as to contain all the possible sets of weaving parameters of the different wefts woven on the loom and of the different working conditions of the loom, associating to each of said sets a default value of the moment of mutual shifting of the selvedge yarns.
- the moment of mutual shifting of the selvedge yarns can thus be adapted to any weaving cycle, according to the type of weft, to the way in which the weft is inserted, to the preset channel of weft insertion, to the weaving speed, and to other variable working parameters of the loom.
- the parametric table R can be replaced by an appropriate algorithm which, on the basis of the weaving parameters concerning each single weft insertion, reckons each time the exact value of the moment of mutual shifting of the selvedge yarns.
- said algorithm can be provided with self-learning functions - well known to a technician skilled in the art - so as to optimize the reckoned result according to the results previously obtained in the same parametric conditions.
- the two systems can of course be combined, selecting the most appropriate mode for each weaving parameter to be placed under control.
- the selvedge forming device also allows, with a fully similar logic, to modify the type of weave not only for each fabric being woven - as done so far in known technique - but also for each weft or group of wefts.
- the selvedge forming device comprises more than two yarn-guide elements which, time after time, are controlled by a driving motor.
- the selvedge forming device comprises more than two yarn-guide elements which, time after time, are controlled by a driving motor.
- four yarn-guide elements can be provided which form each time a set of two yarn-guide elements moving in opposite directions. Each set is then controlled by an autonomous motor and by an autonomous drive shaft. This allows to form special weaves with more selvedge yarns.
- the present invention has fully reached the intended object, namely to be able to control the final tension level of each single weft, by adjusting for each single weft the moment of mutual shifting of the selvedge yarns.
- Such an adjustment can be carried out in any wanted manner, even by differentiating the closing times of the right-hand and left-hand selvedge of the fabric - always within the scope of the present invention - associating thereto also the most appropriate type of weave, without requiring any mechanical interventions or stops of the loom.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Looms (AREA)
- Auxiliary Weaving Apparatuses, Weavers' Tools, And Shuttles (AREA)
- Time-Division Multiplex Systems (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT99MI001221A ITMI991221A1 (it) | 1999-05-31 | 1999-05-31 | Dispositivo e metodo per la formazione della cimosa in un telaio di te ssitura |
ITMI991221 | 1999-05-31 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1079009A2 true EP1079009A2 (fr) | 2001-02-28 |
EP1079009A3 EP1079009A3 (fr) | 2001-05-30 |
Family
ID=11383095
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00111570A Withdrawn EP1079009A3 (fr) | 1999-05-31 | 2000-05-30 | Dispositif et procédé pour former une fausse lisière sur un métier à tisser |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1079009A3 (fr) |
IT (1) | ITMI991221A1 (fr) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0872653A (ja) * | 1994-09-06 | 1996-03-19 | Sensor Technol Kk | エアバッグ装置 |
US5803133A (en) * | 1995-05-29 | 1998-09-08 | Picanol N.V. | Selvage-forming device for a power loom |
EP0878570A1 (fr) * | 1997-05-16 | 1998-11-18 | Lindauer Dornier Gesellschaft M.B.H | Procédé pour former une lisière de tissu et une lisière de retenue lors de la fabrication de tissu sur métiers à tisser ainsi que dispositif pour la mise en oeuvre de ce procédé |
EP0893522A1 (fr) * | 1997-07-17 | 1999-01-27 | NUOVA VAMATEX S.p.A. | Dispositif pour contrÔler le méchanisme des lisses àcoulisse pour le tissage de la gaze dans les métiers à tisser |
-
1999
- 1999-05-31 IT IT99MI001221A patent/ITMI991221A1/it unknown
-
2000
- 2000-05-30 EP EP00111570A patent/EP1079009A3/fr not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0872653A (ja) * | 1994-09-06 | 1996-03-19 | Sensor Technol Kk | エアバッグ装置 |
US5803133A (en) * | 1995-05-29 | 1998-09-08 | Picanol N.V. | Selvage-forming device for a power loom |
EP0878570A1 (fr) * | 1997-05-16 | 1998-11-18 | Lindauer Dornier Gesellschaft M.B.H | Procédé pour former une lisière de tissu et une lisière de retenue lors de la fabrication de tissu sur métiers à tisser ainsi que dispositif pour la mise en oeuvre de ce procédé |
EP0893522A1 (fr) * | 1997-07-17 | 1999-01-27 | NUOVA VAMATEX S.p.A. | Dispositif pour contrÔler le méchanisme des lisses àcoulisse pour le tissage de la gaze dans les métiers à tisser |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 1996, no. 07, 31 July 1996 (1996-07-31) & JP 08 072653 A (SENSOR TECHNOL KK), 19 March 1996 (1996-03-19) * |
Also Published As
Publication number | Publication date |
---|---|
ITMI991221A1 (it) | 1999-08-31 |
EP1079009A3 (fr) | 2001-05-30 |
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